Giant male insect seen around in the morning (7)
I believe the answer is:
mammoth
'giant' is the definition.
(thesaurus)
'male insect seen around in the morning' is the wordplay.
'male' becomes 'm' (common abbreviation).
'insect' becomes 'moth' (moth is a kind of insect).
'seen around' indicates putting letters inside.
'in the morning' becomes 'am'.
'm'+'moth'='mmoth'
'mmoth' placed around 'am' is 'MAMMOTH'.
(Other definitions for mammoth that I've seen before include "Gigantic - extinct animal" , "Enormous" , "Extinct hairy elephant" , "Large extinct beast" , "Large extinct elephant" .)